Upgrade Traefik chart to official

[thomasprade]

In commit cf10288 changes were made to the installation of traefik via the official helm chart.

I'm currently running a cluster created in mid November of 2022 with the, then current, version of the repo.
The version of the traefik chart installed is fixed via the chart, that was deployed back then (see snippet below), and in the "Installed Apps" menu in Rancher traefik is marked as "managed".

apiVersion: helm.cattle.io/v1
kind: HelmChart
metadata:
  annotations:
    helmcharts.cattle.io/managed-by: helm-controller
    objectset.rio.cattle.io/applied: >-
      H4sIAAAAAAAA/4yRT4vbMBDFv0oY2FMdO4nXTVbQQ7oNtCyUsv1zCpSxNIlVy5LQjFOW4O9elBbasnS7N4kZ/d7Te2fAaL9QYhs8KOjIDaVGEUelDdVpCQX01htQ8JbccNthEihgIEGDgqDOgN4HQbHBc76G9htpYZIy2fAHymYGFP+ch++e0vx46kFBX/NfJorZnfXm1daY4P+L8DgQKJCEdLD9s9Y5os5v+rGlOT+w0ABTAQ5bck9+qkPuQIFprrHWhjY3jV4dsKnNom2W180G10jLm1W9rtd0eFln6CN7TxjgSDrL60vsCjqRyKqqrs53n1/v7t/vPu0+ft1+eDddVZwr0NVlk6tf9PlqUdbl8sUYL4cFFMAkmXh0oUVX/pR6QwccndzT0bKkh9zTVMAJ3Uh8G7yQz+IxmO3vqtXez2YxhYGko5FzGDEkUbM9bBab1R4ez1knmKYfAQAA//9vboxDcQIAAA
    objectset.rio.cattle.io/id: ''
    objectset.rio.cattle.io/owner-gvk: k3s.cattle.io/v1, Kind=Addon
    objectset.rio.cattle.io/owner-name: traefik
    objectset.rio.cattle.io/owner-namespace: kube-system
  creationTimestamp: '2022-12-16T09:50:09Z'
  finalizers:
    - wrangler.cattle.io/on-helm-chart-remove
  generation: 4
  labels:
    objectset.rio.cattle.io/hash: d54a3cde895c2fa53d0b51458a7ae1923737ef63
  managedFields:
    - apiVersion: helm.cattle.io/v1
      fieldsType: FieldsV1
      fieldsV1:
        f:metadata:
          f:annotations:
            .: {}
            f:helmcharts.cattle.io/managed-by: {}
            f:objectset.rio.cattle.io/applied: {}
            f:objectset.rio.cattle.io/id: {}
            f:objectset.rio.cattle.io/owner-gvk: {}
            f:objectset.rio.cattle.io/owner-name: {}
            f:objectset.rio.cattle.io/owner-namespace: {}
          f:finalizers:
            .: {}
            v:"wrangler.cattle.io/on-helm-chart-remove": {}
          f:labels:
            .: {}
            f:objectset.rio.cattle.io/hash: {}
        f:spec:
          .: {}
          f:chart: {}
          f:set:
            .: {}
            f:global.systemDefaultRegistry: {}
          f:valuesContent: {}
        f:status:
          .: {}
          f:jobName: {}
      manager: deploy@control-plane-fsn1-wnn
      operation: Update
      time: '2023-02-08T10:17:43Z'
  name: traefik
  namespace: kube-system
  resourceVersion: '36996614'
  uid: e6b82585-5b1b-4ad7-9720-77a6d2c4ce6f
spec:
  chart: https://%{KUBERNETES_API}%/static/charts/traefik-20.3.1+up20.3.0.tgz
  set:
    global.systemDefaultRegistry: ''
  valuesContent: |-
    podAnnotations:
      prometheus.io/port: "8082"
      prometheus.io/scrape: "true"
    providers:
      kubernetesIngress:
        publishedService:
          enabled: true
    priorityClassName: "system-cluster-critical"
    image:
      name: "rancher/mirrored-library-traefik"
      tag: "2.9.4"
    tolerations:
    - key: "CriticalAddonsOnly"
      operator: "Exists"
    - key: "node-role.kubernetes.io/control-plane"
      operator: "Exists"
      effect: "NoSchedule"
    - key: "node-role.kubernetes.io/master"
      operator: "Exists"
      effect: "NoSchedule"
    service:
      ipFamilyPolicy: "PreferDualStack"
status:
  jobName: helm-install-traefik

Since then changes were made to the values.yaml, which include a default redirect to https for the http entry point.
When manually upgrading traefik via Rancher to a newer version and including the redirect line in the values.yaml, each night the changes are reverted to the version and values configured in the chart, that was originally deployed when the cluster was created.

Since the cluster is used in a production environment, I do not want to risk simply removing the old chart and manually installing a newer version of traefik.
Has anyone done this upgrade already, or can tell, how to savely do the upgrade?

[mysticaltech]

@thomasprade Sorry for the delay, it's been done! Please search this repo for Traefik upgrade. However, the best guide is here https://pet2cattle.com/2021/12/k3s-update-traefik-to-v2.

Please note that it may attempt to recreate the service, hence causing a very small downtime as the LB IP might change. Also, note that any customization you need must not be done on the HelmChart, but on the HelmChartConfig file, see our repo in the template folder for an example.